Centrifugal machine.



ALJ. ERICSSON; OENTMPUGAL 'MAGHINR APPLICATION FILED 00T. Z, 1906.

Patented oct. 6,"1908.

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UNITED STATES PATENT oEEroE. ANDERS JoEANERIoSSoNgoE STOCKHOLM, ASSIeNoR'ToAKTiEEoLAGET 1 SErAnATon,0ESTOCKHOLM,SWEDEN.i i

` GENTEIFUGAI. MACHINE-.

specification of Letters lement.

Patented Oct. 6, 1908.

No. 900,089. y

. A Application filed october 2, 1906. "serial No.' 337,063.

To all whom 'it mag/concern:

a Be it known that I, ANDERSJoi-IAN ERICS- soN, a subject of the King of Sweden, resid- 7 ing at 8 vFleminggatan, Stockholm, Sweden,

have invented certain new Y and useful Im-v provements 1n Centrifugal Machines j for Separating Solids from Liquid-s;y and-Ido hereby declare the following tol be Ja full,f. x clear, and eXact description of the invention,

such as will a. enable -xothers skilled vin, the "art to whichit appertains ltomake Aand use .the same, reference beinghad tothe accompanying drawings, and toletters or iguresof reference marked thereon, Awhich form ak part of this specification. a l i The present invention rel Vtes to improvements in centrifugal machines 'for' separating solids from liquids of that class in whichthe solids,\stratified along the linner wall ofthe bowl or drum, arecarried down to scraperwheels or other devices in the bottomk ofthe bowl, whereupon `they are brought outside the bowl by means of `said devices. a.

' Theobject of the' present invention is attainedby causingthe solids tobe caught ina separate bowl, movablyarranged within the centrifugal bowl proper. VVVThe said inner bowl is given either a conical shape, sothat no `Scrapers arerequiredffor conveying the solids to'fthe bottom `of the bowl or a cylindrical shape, in which case. inclined Scrapers, immovably arrangedrelativ'ely to the `centrifugal bo'wl andv to the liquiditherein,act against the said `inner bowl; NWhen the latter is rotated, the solids'stratifiedjthereon,

will also-"rotate and a'frelativeTmotiongis.

created between the solids and the Scrapers'.

The solids will thenv be scraped down .along` the wall of fthe inner bowl andfwhen arrivupby scraper-wheels orl like transporting de- 1 vice in' the bowl.

,like may-be arrangedvin the bottom ofithe` centrifugal bowl properandl then the solids' and the scraper wheels'or-thelikewill move relatively'to eachother.

i The inventionisillustrated on theannened ing at the lower edge thereof, theyv are caught,

Said scraper-wheels or the bowl lm. having the discharge outlet 21 vin line `with the discharge outlet 20 of bowl a.

' l In Figs. l and 2 a is the bowl havingthe liquid dischargejopeningQ() and b the bottomthereof secured together by means -of a threaded ring 0f The bowl is of conical shape so that the solidswill slide down to other toothed Awheels. g, which together with the scraper-wheels la, are rotatable on the `shafts i `secured to the bottom of the bowl.

To the top of the'shaft e a hub 7c is secured, which supports theinner bowl m by means conicallshape.V

" The inner bowl 1S provided with flanges n,

:so that an annular space is formed in which kthe solids may accumulate. lwheels it' eXtendalmost to the inner wall of The scraperthe said bowl m.

. The operation is as follows: The two shafts (Zand e are caused to rotate at different speeds by any suitable means, not shown on the drawing, and bymeans of the toothed wheels f1 and g the scraper-wheels h are rotated on the shafts z' inthe direction indig cated `by V the arrows .l and further the bowl mwill rotate relatively to the bowl a` as in- `idicated by the arrows '2. The solids will lslide along the conical wall'v of the bowl a or `the upper part' of the bowl m are caught in fthe latter,l that'isto say, its lower part, and are conveyed in a circumferential direction :to:` the scraper-wheels la, which rotateon ltheirshafts in the opposite direction. `The Iscrapers carry the solids through the layer of liquid towards the center of the bowl, and

owing-to the centrifugallforce acting on the :Solids-the-latter will then slide along` the Scrapers, and'arecaught by the inclined `ishieldsl 0,` which direct them vthrough the apertures 29 in the bottom of the bowl, .through whicv-hjthey escape to the exterior.

' If the bowl is of cylindrical shape instead of conical and is providedwith a liner, the form shown in Fig. 3 is used. In this figure,

however, the lower part of the inner bowl is omitted, since in this construction the shafts Jof the scraper-wheels rotate around the aXis when the bowl is `of` `the bottom` thereof. Through the `hollow bowl shaft d another solid shaft e passes, `said latter-shaft being provided at its upper part `witha toothed wheel 7 meshing with the of the bowl, imparting to the scraper-wheels a planetary motion in the bowl. Owing to this planetary motion the scrapers will travel along the periphery of the bowl and no means will then be necessary for conveying the solids to the scrapers. It is, however, evident, that the same construction of the scraper-wheels and the lower parts of the bowl may be used in this combination as in Figs. l and 2.

In F ig. 3, L is the bowl, Y) the bottom thereof, (l the outer and e the interior shafts. To the top of the shaft e a disk r is secured, on which the inner bowl m is mounted. Said inner bowl is located between` the bowl a and the liner s and is provided at its lower edge with holes m for passage of the solids. On the liner inclined sera-pers t are arranged. To said disk fr are secured the shafts z' on which the scraper-wheels /L are mounted, said scraper-wheels being secured to rolls or friction-wheels u, which engage the ring c, secured to the bottom of the bowl.

If the solids should accumulate in the space between the bowls a and m they will be scraped down by means of the inclined or helical scrapers e arranged on the exterior of the bowl m. A

The operation is as follows: Then the shafts Z and e rotate relative to each other, the bowl m will rotate between the bowl a and the liner s, whereupon the solids, which have become stratified on the said bo'wl, will be scraped down by the inclined scraperst, moving relatively thereto, and will then pass through the holes m to the bottom of the bowl. On the other hand the friction wheels u will roll upon the ring o being forced against same by the centrifugal force. The scraper-wheels It will. then rotate upon the shafts z' and when said shafts have a rotary motion relatively to the bowl, the scraperwheels will be given a planetary motion within the bowl, and catch the solids, scraped down to the bottom, along the whole periphery of the bowl and convey them to the center thereof where they slide from the scrapers to the shields 0 which direct them to the holes p leading to the exterior of the bowl. If no liner `is used, the Scrapers may be secured to a central perforated pipe, drum or the like.

Having now particularly described and ascertained the nature of the said invention and in what manner the same is to be performed, I declare that what I claim is l. In centrifugal machines for separating solids from liquids, in combination, an outer bowl rotatably mounted and having an imperforate periphery, a second bowl, having an imperforate periphery above the lower end, mounted within the first mentioned bowl and concentrictherewith, and adapted to rotate at a speed different from that of the iirst mentioned bowl, there being an outlet for the solids through thel lower portion ofthe inner bowl and a corresponding outlet through the lower portion of the outer bowl.

2. In centrifugal machines for separating solids fromy liquids, in combination. an outer bowl rotatably mounted and having an iniperforate periphery, a second bowl, having an imperforate periphery above the lower end, rotatably mounted within theI iirst nientioned bowl and concentric therewith.

3. In centrifugal machines for separating solids from liquids, in con'ibination, an outer bowl rotatably mounted and having an iniperforate periphery, a second bowl, having` an imperforate periphery above the lower end rotatably mounted within the firsty mentioned bowl, and concentric therewith. means to bring the solids collected on the periphery of the second bowl. to the lower portion thereof, there being an outlet for the solids through the lower portion of said inner bowl, and scrapers to convey said solids toward the center, there being an outlet for the solids through the outer bowl.

et. In centrifugal machines for separating solids from liquids, in combination. an outer bowl rotatably mounted and having an iinperforate periphery, a second bowl, having an imperforate periphery above the lower end, rotatably mounted within the first bowl and concentric therewith, means to bring the solids collected on the periphery of the inner bowl to the bottom thereof, there being an outlet through t-he inner bowl at the lower portion thereof, and scrapers at the bottom. surrounded by said second bowl, to convey said solids toward the center, to which said Scrapers are adapted to convey the solids, there being an outlet through the outer bowl.

5. In centrifugal machines for separating solids from liquids, in combination, an outer bowl rotatably mounted and having an imperforate periphery` a second bowl, having an imperforate periphery above the lower end, rotatably mounted within the irst bowl and concentric therewith, and Scrapers between the two bowls and revolving with the inner bowl.

6. In centrifugal machines for separating solids from liquids, in combination, an outer bowl rotatably mounted and having an imperforate periphery, and provided with a liner, a second bowl, having an imperforate periphery above the lower end, rotatably mounted within the first bowl and concentric therewith, and inclined Scrapers secured to said liner and acting along the inner wall of said inner bowl.

7. In centrifugal machines for separating solids from liquids, in combination, an outer bowl rotatably mounted and having an inlperforate periphery, a second bowl, having an imperforate periphery above the lower end, rotatably mounted within the lirst bowl bowl rotatably mounted and having an iin-3 perforate periphery, a second. bowl, having an imperforate periphery above thelower end, rotatably mounted'within the rst bowl and lconcentric tl1erewith,`.said'second bowl f having orifices for the discharge of the solids at the lower portion of said bowl, and in.- clined Scrapers operating lalong the inner wall of said inner bowl to carry Vthe solids to said oriices. y

9. In centrifugal machinesfor separating solids from liquids, in combination, an outer bowl rotatably mounted and having an imperforate periphery, and provided with a central device adapted to allow the liquid to pass, a second bowl, having an imperforate periphery above the lower end, rotatably mounted within the rst bowl and concentric therewith, and an inclined scraper connected to said central device.

as vmy invention, I have signed my name in `presence of two subscribing witnesses.

ANDERS JOI-IAN ERICSSON.

" In testimony, that Iclaim the foregoing 25 

